Well it was two questions, so you get two answers:
1. There is no such thing.
2. C language is used in computer-programming.
There is no "latest version of C". However, you might be referring to the latest version of the C Standard, which is officially C99. Mind you that some compilers do not implement all features of C99.
3.0
C language doesn't have versions; the latest commonly used standard is ANSI C99.
C++ compilers are many and varied. There is no single "latest compiler" because every IDE implements their own version according to the current C++ standard. However some (Microsoft in particular) do not fully adhere to the C++ standard. The "latest compiler" for your IDE is either provided as an interim update to the IDE, or by upgrading the IDE to the latest version.
version 3.0, 1992 (19 years ago!)
Windows 95 version C was the last version to be released - on 26th November 1997. It ceased to be supported as of 1st January 2002.
For example defining types intNN_t and intptr_twas a good idea.
The language doesn't have versions, but there are standards like C99 or C1X (pending).
You can download latest version of Visual Studio from microsoft.com
The latest version in SAS is 9.1.3.
The latest stable version is 25.0.1
The latest version of css is css3